package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 微信用户购物车下单
 */
@Service
@Slf4j
public class OrderServiceimpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;


    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //异常情况的处理（收货地址为空、超出配送范围、购物车为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);

        //查询当前用户的购物车数据
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //构造订单数据
        Orders order = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,order);
        order.setPhone(addressBook.getPhone());
        order.setAddress(addressBook.getDetail());
        order.setConsignee(addressBook.getConsignee());
        order.setNumber(String.valueOf(System.currentTimeMillis()));
        order.setUserId(userId);
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setPayStatus(Orders.UN_PAID);
        order.setOrderTime(LocalDateTime.now());

        //向订单表插入1条数据
        orderMapper.insert(order);

        //订单明细数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(order.getId());
            orderDetailList.add(orderDetail);
        }

        //向明细表插入n条数据
        orderDetailMapper.insertBatch(orderDetailList);

        //清理购物车中的数据
        shoppingCartMapper.deleteByUserId(userId);

        //封装返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(order.getId())
                .orderNumber(order.getNumber())
                .orderAmount(order.getAmount())
                .orderTime(order.getOrderTime())
                .build();

        //来单提醒 该方法应放于支付完成后运行，因支付无法完成，改成下单后就提醒
        Map map=new HashMap();
        map.put("type",1);
        map.put("orderId",order.getId());
        map.put("content","订单号："+order.getNumber());

        //通过WebSocket实现来单提醒，向客户端浏览器推送消息
        webSocketServer.sendToAllClient(JSON.toJSONString(map));

        return orderSubmitVO;
    }

    /**
     * 历史订单查询
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult historyOrders(OrdersPageQueryDTO ordersPageQueryDTO) {
        //设置分页
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        //将用户ID加入到DTO中
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        //分页条件查询 page表示每一页的数据，Orders表示订单对象
        Page<Orders> page = orderMapper.ordersPageQuery(ordersPageQueryDTO);

        List<OrderVO> orderVOList = new ArrayList<>();

        //查询出订单明细，并封装入OrderVo中进行响应
        if (page != null && page.getTotal()>0){
            for (Orders orders : page) {
                Long orderId=orders.getId();  //订单id
                // 查询订单明细
                List<OrderDetail> orderDetails=orderDetailMapper.getByOrderId(orderId);
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetails);
                orderVOList.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(),orderVOList);  //表示每一页的数据，表示每页订单对象
    }


    /**
     * 查询订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO orderdetail(Long id) {
        //根据订单id查询订单详情
        Orders orders =orderMapper.getById(id);
        //查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        //将该订单及其详情封装到OrderVo并返回
        OrderVO orderVO=new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 用户取消订单
     * @param id
     */
    @Override
    public void cancel(Long id) throws Exception {
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);
        //校验订单是否存在
        if (ordersDB==null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单状态 1待付款 2待接单 3已结单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus()>2){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = new Orders();       //这两行代码好像脱裤子 ， 不知道为啥把自己的id给自己
        orders.setId(ordersDB.getId());
        //订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            //调用微信支付退款接口
            WeChatPayUtil.refund(
                    ordersDB.getNumber(),  //商户订单号
                    ordersDB.getNumber(),  //商户退款单号
                    new BigDecimal(0.01),  //退款金额，单位 元
                    new BigDecimal(0.01)   //原订单金额
            );
            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }
        //更新订单状态，取消原因，取消时间
        orders.setStatus(Orders.CANCELLED);  //更新订单状态
        orders.setCancelReason(ordersDB.getRejectionReason());  //取消原因
        orders.setOrderTime(LocalDateTime.now());   //取消时间
        orderMapper.update(orders);

    }


    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id) {

        //查询当前用户ID
        Long userId=BaseContext.getCurrentId();

        //根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将订单详情对象转换为=购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x-> {
            ShoppingCart shoppingCart = new ShoppingCart();

            //将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart,"id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return  shoppingCart;
        }).collect(Collectors.toList());

        //将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }


    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        //设置分页
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());
        Page<Orders> page=orderMapper.pageQuery(ordersPageQueryDTO);

        //部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVo
        List<OrderVO> orderVOList=getOrderVoList(page);
        return new PageResult(page.getTotal(), orderVOList);

    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        //根据状态，分别查询出待接单、带派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO=new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }

    /**
     * 客户端接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders=Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);



    }

    /**
     * 客户端拒单
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        //根据id查询订单
        Orders ordersDB=orderMapper.getById(ordersRejectionDTO.getId());

        //订单只有存在且状态为2（待接单） 才可以拒单
        if (ordersDB==null||!ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //支付状态
        Integer payStatus=ordersDB.getPayStatus();
        if (payStatus==Orders.PAID){
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),  //商户订单号
                    ordersDB.getNumber(),  //商户退款单号
                    new BigDecimal(0.01),  //退款金额，单位 元
                    new BigDecimal(0.01)); //原订单金额

                    log.info("申请退款：{}",refund);
        }
        //拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders=new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void cancelK(OrdersCancelDTO ordersCancelDTO) throws Exception {
        //根据id查询订单
        Orders ordersDB=orderMapper.getById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus=ordersDB.getPayStatus();
        if (payStatus==1){
            //用户已支付，需要退款
            String refund=weChatPayUtil.refund(
                    ordersDB.getNumber(),  //商户订单号
                    ordersDB.getNumber(),  //商户退款单号
                    new BigDecimal(0.01),  //退款金额，单位 元
                    new BigDecimal(0.01));
            log.info("申请退款：{}",refund);
        }
        //管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders=new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        //根据id查询订单
        Orders ordersDB=orderMapper.getById(id);

        //校验订单是否存在，并且状态为3
        if (ordersDB==null||!ordersDB.getStatus().equals(Orders.CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders=new Orders();
        orders.setId(ordersDB.getId());
        //更新订单状态，状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id) {
        //根据id查询订单
        Orders ordersDB=orderMapper.getById(id);

        //校验 订单是否存在，并且状态为4（派送中）
        if (ordersDB==null||!ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders=new Orders();
        orders.setId(ordersDB.getId());
        //更新订单状态，状态转化为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 用户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        //查询订单是否存在
        Orders orders=orderMapper.getById(id);
        if (orders==null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //基于WebSocket实现催单
        Map map=new HashMap();
        map.put("type",2);    //2代表用户催单
        map.put("orderId",id);
        map.put("content","订单号："+orders.getNumber());

        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    /**
     * 订单搜索1
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVoList(Page<Orders> page){
        //需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList=new ArrayList<>();

        List<Orders> ordersList=page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                //将公共字段复制到OrderVO
                OrderVO orderVO=new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes=getOrderDisherStr(orders);

                //将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 订单搜索2 接上
     * @param orders
     * @return
     */
    private String getOrderDisherStr(Orders orders){
        //查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3）
        List<String> orderDishList=orderDetailList.stream().map(x->{
            String orderDish = x.getName()+"*"+x.getNumber()+";";
            return orderDish;
        }).collect(Collectors.toList());

        //将该订单对应的所有菜品信息拼接在一起
        return String.join("",orderDishList);
    }
}
